/* 追加セクションも既存見出しと同じ450msで、一度だけフェードイン。 */
[data-section-fade][data-section-fade-state='pending'] { opacity: 0; }
[data-section-fade][data-section-fade-state='playing'] { animation: section-fade-in 450ms cubic-bezier(.25,.46,.45,.94) both; }
@keyframes section-fade-in { from { opacity: 0; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
 [data-section-fade] { opacity: 1 !important; animation: none !important; }
}
@media print { [data-section-fade] { opacity: 1 !important; animation: none !important; } }